Vaginal cyst after sex

Patient

Q: HI,AFTER a sex session with a well endowed partner,i developed a tiny cyst in my vagina,on the left hand side.it swells up and goes down again on a daily basis.
it is painless,but im scared to have sex in case it hurts,

doctors examined saying im healthy down there but i never had this before,i know my body,can you help?

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